GDSTTS_datasheet

8/12/2019 GDSTTS_datasheet

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GDS Triaxial Testing System (GDSTTS)

Key Features: Benets to the User:

Each system may be congured to the

customers specication and budget:

Users can choose the transducers, pressure controllers, triaxial cell or just

parts to integrate into existing equipment to build their ideal set-up.

Direct actuation of axial stress through

the hydraulically controlled ram in the

base of each cell:

The Bishop and Wesley cell is designed specically for stress path testing.

Direct axial stress application means greater accuracy for stress control.

GDSTTS can run advanced tests: Tests such as stress paths, slow cyclic and K0, all under PC control.

Standard through to advanced

congurations:

GDS provide advanced (ADVTTS) systems with all the features of the standard

systems but with higher accuracies and resolution.

May be upgraded at any time:Additional transducers, software modules, bender element testing and

unsaturated testing makes the system future proof.

Tests that can be Performed:

B-check saturation, unconsolidated undrained (UU) triaxial, consolidated drained (CD) triaxial, consolidated undrained

(CU) triaxial, consolidation (Triaxial), constant rate of loading (CRL), constant rate of strain (CRS), slow cyclic testing, K0

(K-Zero), multi-stage testing, quasi-static (low speed/creep) tests and stress paths.

Please Note - The availability of tests may depend on selected hardware/software.

Upgrade Options:

Bender element system (Vertical, Horizontal, S and P waves), hall effect local strain, LVDT local strain and unsaturated

testing. A high pressure STDTTS is available for cell pressure up to 10MPa.

Overview:The GDS Triaxial Testing System (GDSTTS) is a

fully automated triaxial testing system designed principally

for stress path testing. The GDSTTS is based on the classic

Bishop & Wesley type stress path triaxial cell which controls

stress directly on the sample. The system can be congured

using Enterprise, Standard or Advanced level controllers

(depending on the required accuracy / maximum pressure).

The 38/50mm cell can provide up to 7kN axial force, with

the larger 70/100mm cell up to 25kN. This is the system of

choice for teaching laboratories and research institutes.

Standards:

www.gdsinstruments.com

World leaders in the manufacture of laboratory systems for soil & rock

Technical Specication:

Accuracy of Pressure Measurement: Standard (STDTTS)


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Systems Elements & Options

The fundamental system hardware elements are

shown in Fig. 1 below. The actual hardware used

may be chosen to suit your testing and budgetaryrequirements.

Load Frames & Triaxial Cells

7kN/2000kPa, for specimens up to 50mm (38mm

and 50mm as standard).

25kN/2000kPa, for specimens up to 101.8mm (38,

50, 70 and 100mm as standard).

20kN/10MPa, for specimens up to 50mm (38mm

and 50mm as standard).

Pressure Volume / Controllers

Enterprise Triaxial Automated System (ELTAS)

which is based on 1MPa Enterprise Pressure/

Volume Controller (ELDPC).

Standard Triaxial Automated System (STDTAS)

which is based on 3MPa Standard Pressure/

Volume Controller (STDDPC).

Advanced Triaxial Automated System (ADVTAS)

which is based on 2MPa Advanced Pressure/

Volume Controller (ADVDPC).

High Pressure Triaxial Automated System (HPTAS)

which is based on High Pressure Controllers (

16MPa).

8 Channel Serial Pad

The standard GDS 8 channel data acquisition device, knownas the serial data pad, may be used within any of the system

combinations. This 16 bit device has 8 computer controlled gain

ranges, specically designed to suit transducers used in a triaxial

test. i.e.

+/-10mV, +/-20mV, +/-30mV (load cells)

+/-100mV, +/-200mV (pressure transducers)

+/- 1V, +/- 5V, +/- 10V (displacement transducers)

GDSLAB Software

The GDSLAB control and

acquisition software is a highly

developed, yet extremely exible

software platform. Starting with

the Kernel module and the ability

to perform data acquisition,

additional modules are addedfor your testing requirements.

Cell pressure control

Axial stress and axial

displacement control

Load frame control

Load Cell (kN)

Axial Strain (mm)

Pore Pressure (kPa)

Note: Connection via RS232

multiplexer (mux) or PC resi-

dent IEEE card (depending

on device type chosen) Setting back pressure

and measuring volume

change.




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Upgrade to Unsaturated Testing

Any GDSTTS system can be upgraded to perform unsaturated triaxial testing with

the addition of the following items:

Unsaturated pedestal with high air entry porous stone

1000cc Advanced Pressure/Volume Controller (for application of pore air

pressure and measurement of air volume change).

For further information on unsaturated testing methods, please refer to the

unsaturated datasheet.

Upgrade to Bender Element Testing

Any GDSTTS system can be upgraded to perform P and S wave bender

element testing with the addition of the following items:

Bender element pedestal with bender element insert.

Bender element top-cap with bender element insert.

High-speed data acquisition card.

Signal conditioning unit which includes amplication of source and

received signals (P and S-wave) with user controlled gain levels (via

software).

GDS Bender Element Analysis Tool:

The subjectivity and lack of satisfactory standards for interpreting shear

wave travel times across the industry from bender element test data, has

led GDS to develop a bender elements analysis tool. The tool allows the

rapid, automated analysis of bender element tests to objectively estimate

the shear wave travel time. The analysis tool is available to download from

GDS website.

Upgrade to Local Strain Measurement

Any GDSTAS system may be upgraded to perform Local Strain Measurement using

either Hall Effect or LVDT transducers. Both devices enable axial and radial deformation

to be measured directly on the test specimen via lightweight aluminium holders.

Hall Effect transducers may be used in water up to 1700kPa. LVDT transducers come

in 2 versions:

Low pressure (up to 3500 kPa) version for use in water

High pressure (up to 200 MPa) version for use in nonconducting oil Fig. 2 LVDT transducers as shownon sample.

Fig. 3 Advanced Pressure Controller

used in Unsaturated Testing

Upgrade Options:

Local strain measurement, unsaturated testing and bender element system (Vertical, Horizontal, S and P waves),



Fig 4. Screen shots from GDSBES software


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GDSLAB Control Software

GDSLAB is the control and data acquisition software for geotechnical laboratory applications. GDSLAB starts with a core

application known as the kernel. The GDSLAB kernel allows for data acquisition from your hardware, but no test control.

Simply add the appropriate module or modules to complete the test suite functionality you require. GDSLAB is compatible

with all existing GDS equipment and furthermore key hardware from other manufacturers.

GDSLAB has the ability to be congured to your hardware of choice, no matter how unique the arrangement. A text le

(*.ini) or initialisation le is created that describes the hardware connectivity to the PC. The hardware layout is available

in graphical format via the GDSLAB object display. This makes setting up the devices and checking the connectivity

extremely simple.

Operating System: Windows XP SP3 or higher (We recommend that whichever version of Windows you are running, that it is up to date with the latest

Service Pack). PC Spec Hardware: 1GHz (minimum) / 1GB Ram (minimum): CD Rom.

GDSLAB REPORTS Presentation Software

GDSLAB REPORTS software presents data obtained by GDSLAB

to the National Standard, BS 1377:1990. The program can be

used to present data whether obtained from a GDSLAB data le or

inputted by hand.

GDSLAB Reports can as be used with other manufacturers

dataloggers as well as all versions of GDS data logger. The results

can be exported as a CSV le into Microsoft Excel, allowing the

user to customise the layout of results.

Tests that can be Performed:

B-check saturation, unconsolidated undrained (UU) triaxial, consolidated drained (CD) triaxial, consolidated undrained

(CU) triaxial, consolidation (Triaxial), constant rate of loading (CRL), constant rate of strain (CRS), slow cyclic testing, K0

(K-Zero), multi-stage testing, quasi-static (low speed/creep) tests and stress paths.

Fig 5. Show a typical set-up screen in GDSLAB Fig 6. Show a typical station

test stage set-up in GDSLAB

Fig 7. Show a typical station test stage

set-up in GDSLAB

Fig 8. show a selection of screenshots from the GDLAB

Reports software.




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GDS Instruments Tel: +44 (0) 1256 382450 Fax: +44 (0) 1256 382451 e: [email protected] Web: www.gdsinstruments.com

Due to continued development, specications may change without notice. See the GDS website for the

full product range & to visit our Geotechnical Learning Zone.

Technical Support:

GDS provide comprehensive on-site product training and installation. GDSunderstand the need for ongoing after sales support, so much so that they

have their own dedicated customer support centre. The support centre

allows the user to log queries, download helpsheets and get the latest

information on product updates. The site is fully searchable and provides a

great resource to customers.

Alongside their support centre GDS use a variety of additional support

methods including...

Remote PC Support: Remote PC support works by GDS providing a

secure link to a customers PC, thereby allowing GDS to take control.

Once in control of the PC, GDS can help with any problems associated to software, installation, testing etc.

Product Helpsheets: Thehelpsheets are the GDS FAQ documents. They cover a multitude of hardware andsoftware questions and are free to download from our online support centre.

YouTube Channel: GDS YouTube channel holds both software and hardware videos aimed to give you better

understanding of how the products work.

Email & Telephone Support: If you prefer you can email requests to [email protected] where they

will be automatically added to the support system and then allocated to a support engineer.

Made in the UK:

All GDS products are designed, manufactured and assembled in the UK at

our ofces in Hook. Quality assurance is taken of all products before they

are dispatched.

GDS are an ISO9001:2000 accredited

company. The scope of this certicate

applies to the approved quality

administration systems relating to the

Manufacture of Laboratory and Field

Testing Equipment.

Why Buy GDS?

GDS Awarded Queens Award for Enterprise in International

Trade:

GDS have been presented with the most prestigious corporate award made

in the UK The Queens Award for Enterprise in the International Trade

category. GDS are delighted to have won the award which has been given

to GDS for increasing overseas trade by 190% over six years of continuous

sustained growth, and for selling over 85% of their production overseas. GDS

have achieved this through a combination of continuous product development,

understanding customers requirements and a company wide dedication to

customer support.

Fig 9. GDS online customer support centre.

GDSTTS_datasheet

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